Method of selection in systems of communication.



each of these relays, and s o ron. The corresponding or coperatingcontacts ofthe reilays 'are connected to the individual lines orcircuitsto be selected. Thus, in the relay .R- appear the terminalsof'lines #l'to 41:10;l in relayR2 appear the terminals of linesv #11 to#20; and in the relay R* ap ear the the airs a, b,- c, etc., isconnected to the sing e relays R3 R, etc. Thus,1the, pair t ap# pearsonly in the relay R1? and so forth.' I have shownjthe contacts of all,the'units `relays connected on one side to a common circuit 12, to.which is connected a telephone-'0.

.I have shown line' #1, which is the first outside-line on relay R,connected to'a telephone S,'and.it is to ybe -understood that all theother-terminals may be connected to similar 'or any-desired apparatus. l

' The operation of selecting any one of the' lines represented on thetens relays is as follows: Suppose itvbe desired to connect l25 thetelephone O with the telephone S; the

line circuit leading t0 S is #1, which a pears' only'in the terminals onrelay Hence the operator presses the key T 'to energize ythe relay Rthrough the following circuit; B, 8,' vT', 2, Rand ground. Relay Rinpulling up connects "all ofthe lines #1 to #10 on to the pairs of wirea, ,6, c', al,

` etc., in the Acable C. As these pairs Vare distributed among the'relays R', R3, R, etc., it follows that we have thus connected thelines #l to #10 to the units relays 'respectively from R to R1 and'byenergizing'any de-v vsired one of these relays we may select any one othe individual lines which have be' comethusconnected. In the `presentcase the operator -depresses the key U', which closes the circuit'of therelay R as follows: B, l0, U', 1, R and round. IRelay Rf in pulling upconnects t e pair of wires a to the pair 12 leadingto the telephone O,and

thus as lono' as the'two keys T. and U are depressed tahis connectionywillremain es' tablished.

To' take another example, suppose .it be desired to selecta-nd connectwith line #17; the keys T?, and U7 are depressed. Similarly by varyingthecombination of tens and unitskeys. and thereby energizing-the tensand'- units relays in corresponding combinations, anydesired'lin'e orlines may-be selected.

I have employed the keys herein shown for the pur oses of illustrationbecause they constitute t e 'simplest andbest known form of circuitclosers, but in practice other forms of circuit .closers 'are' morefrequently employed. Thus in adapting this arrangement.

-to a 'signaling or telephone system, instead rof depressing twof keysinorder to selecta 'desired circuit, itis' simplest to 'simultane-4 iiilof contacts vin vone of 'the 7 Quartu'- ously two. contacts constitutingtermi- -nals'of heidesired relays, ,Such mn-86:', 'ment which is shownin my prior applicatlona 296,853, filed January V1a, ieoeis also shown fherein in res ect tonne-20,l y key T21l con'- trols a rela 2, which'when energized colnpletesthe atter circuit through J'wires 40 and'180ftothe re ay circuits 4 and 18, simull taneously. Thus the depression ofthe ke T20 or the energization of the relay'R20 wi always connect theline 20 to the circuit 12. It will be understoodfthat' the keys and the"relays shown herein are merely usedfor 'purposes oi illustration, theinvention Alyingv `notfin the 'circuit closers used in the initialcontrol of the `circuit system, but in thearrangement of vthe 'tens4.and units"y relays, and

so., as to producen total number of E lselectionsand connectionsgreater. t an the numberl olf/relays employed. 'It should. be

observed thatthe relation of these relays is l their rcuits, used invariousl combinations not limited to a decimal relation. Thus, thenumber of-contacts carried onthe. relaysR,

R2, etc.,v is limited. only by the requirements of good practice, andthe possibilityfof obtaining suhcient power 1n-'the`jactuatin electromaet.` Similarly, the number o relays R, 2 and R"l which may hej-employedis not f limite'd,. noris the number of the units relays R', R3,-etcFor'exampld twenty relays R, R2, etc., -could "be rovided each of whichhad its ten pairs o' contacts multi- I pled in amanner similar `tothose'in the figure. Any one of two hundred lines could thus beselected. vOr, ten relays R,R2, etc., may. be ,provided each withtwenty' pairs of contacts. It would then 'be' necessary to vide twenty-pairs of wires in the 'cable C-,iand twenty' individual relays RQ-Rij', E, de. f

Numerous. other arrangements )will v'suggest themselves; I 5 In applying'this invention to a telephone exchan e', the circuits 1 to' 30 shownherein would subscribersl'lines, and the circuit 12 a trunk or otherconnective circuit. I have described my .controlling relays Aas jsinglewound, and de nding entirely u on' the selective circuit c osers. AByprovi ing leach relay `with a second winding and a pall" ofcontrolling'contacts 'therefor on its armature, and by running acommonbatter wire toall ofjthese contacts as shown in ig. 2,

iis

each relay may be made to close'its own cirwinding. This arrangement isshown lin ,130

@aeree Y s' I F'gly; Tlms e clesttre of the Y essucatlien ef seeseleemit with e relay circuit troegh the eentrelling de. neetve ageecy cammentie mts 65 25 vice will ealrse it to PUB up :md maint-in theintermeeteageneyn the battery connections en its single Wind-Z'Phemethot ci seleeti'en eed intercon- 5 ing as-long as the lockingwire is intact. "nectonef electrical egerces which consistsV SuchVSelf-locking relays are Well-known in in selectively eenvergmg,plurality of mul- `the art, butrtheix: application to Vmy type et tplegroups of units upon it common inter- 30 Aselecting system Ieonsden'myolves nvenmediate fractional agency, dverging the tion, and Ishall thexefore claim the combiunite of said intermeflate agency,selectively 10 nation. determining their nelfvdual segregation; 3S

Having thus described my invention what Well as the segiegaton of :Lpredetermined I claim and' desire to secme by Letters lgzttgrou@ andthere y the connection of eY unitV 35 ent is: n said group through theintermediate if; "Etta method o interconnection of eleeagency and' thesegregetecl unit thereof teun 15 trical cieuglts ami apparatus whichcerrssts Enel agen-cy @emmenY to {il} the groups enel in selecting oneoi aL plurality of unite leyY all the unite I irstL segregatng :L greupcontaining seid In teetimonygvlteeof' I axmy sigrextme Le unit, andpre'cetemirrng te association of in presence et two Wtesees. fsaidgrmzp' with all i'ntefmeate fractional 20 ragee ey commen te all greugszthen segref Y EB" A D f ULEJMEXL gatmg a gmt 11;;Y seni mtermedmteageney Y XVtnesses: y cee-resperrdmg to the partleular time m the E.EDMONeTeE, JIT.,

selected group, and finally determnng the JAMES H. MAM.'

